研究报告
代卓,郑莉,丁义燊,潘欣颖,许燕滨,杜青平,李宇馨.不同粒径微塑料对三氯生在热带爪蛙蝌蚪体内积累分布及其生态毒性的影响[J].环境科学学报,2022,42(12):450-461
不同粒径微塑料对三氯生在热带爪蛙蝌蚪体内积累分布及其生态毒性的影响
- Effects of microplastics with different particle sizes on the accumulation, distribution and ecotoxicity of triclosan in Xenopus tadpoles
- 基金项目:国家自然科学基金(No.31802025)
- 代卓
- 广东工业大学环境科学与工程学院,广州510006
- 郑莉
- 广东工业大学环境科学与工程学院,广州510006
- 丁义燊
- 广东工业大学环境科学与工程学院,广州510006
- 潘欣颖
- 广东工业大学环境科学与工程学院,广州510006
- 许燕滨
- 广东工业大学环境科学与工程学院,广州510006
- 杜青平
- 广东工业大学环境科学与工程学院,广州510006
- 李宇馨
- 广东工业大学环境科学与工程学院,广州510006
- 摘要:三氯生(TCS)作为药物和个人护理品(PPCPs)中常见的抗菌剂,在水环境中存在与聚苯乙烯微塑料(PS-MPs)复合污染的生态健康风险.本研究旨在探究0.1、5、20 μm PS-MPs吸附TCS在蝌蚪体内累积情况,以及对蝌蚪毒性的作用.结果表明,PS-MPs吸附TCS在蝌蚪体内的积累能力依次为:TCS+5 μm PS组>TCS+20 μm PS组>TCS+0.1 μm PS组,累积量分别为3.27、1.8 mg·g-1、无累积效应.值得注意的是,蝌蚪经不同粒径PS-MPs(2 mg·L-1)、TCS(1 μg·L-1)单独及复合暴露7 d后,各实验组脂质代谢水平均表现出丙酮酸含量增加(p<0.05)、甘油三酯含量降低(p<0.05)的趋势.复合组中TCS+0.1 μm PS组蝌蚪体内丙酮酸(Pyruvate)含量上升水平最显著(p<0.05);TCS+20 μm PS组蝌蚪体内甘油三酯(TG)含量下降水平最显著(p<0.05),这可能与脂代谢调控基因ppar-α、cpt1-β表达水平显著提升有关(p<0.05).此外,PS-MPs、TCS单一和复合暴露 还会增加蝌蚪体内CAT、SOD酶活性.与脂质代谢结果不同的是,复合组中TCS+5 μm PS组蝌蚪体内CAT、SOD酶活性上升最显著(p<0.05),这可能与调控基因cat、sod表达水平显著提升有关(p<0.05).研究表明,复合暴露组对蝌蚪生理水平的影响高于单一暴露组,而不同复合处理组对蝌蚪脂质代谢水平和抗氧化水平影响具有差异,该结果可为评估微塑料(MPs)吸附亲脂性污染物对水生动物的毒性效应和生态风险提供 信息和参考.
- Abstract:Triclosan (TCS), a common antimicrobial agent used in pharmaceuticals and personal care products (PPCPs), poses an ecological health risk due to combined toxicity with polystyrene microplastics (PS-MPs) in water. This study aimed to evaluate the influence of PS-MPs sizes (including 0.1 μm, 5 μm, and 20 μm) on TCS accumulation and toxic effects in tadpoles of Xenopus tropicalis. Our data showed that the accumulation capacity of three sizes of PS-MPs adsorbed TCS in tadpoles following the order of TCS+5 μm PS > TCS+20 μm PS > TCS+0.1 μm PS, and the accumulation amounts were 3.27 mg·g-1 bw, 1.8 mg·g-1 bw, and no accumulation, respectively. It is notable that increased Pyruvate level (p<0.05) and decreased TG level (p<0.05) were detected in tadpoles exposed to individual or combined PS (2 mg·L-1) and TCS (1 μg·L-1) for 7 days. Among combined exposure groups, most significant increase in Pyruvate level (p<0.05) and most decrease in TG level (p<0.05) were detected in TCS (1 μg·L-1)+0.1 μm PS (2 mg·L-1) group and TCS+20 μm PS group, respectively. This may be caused by the significantly aggravated expression levels of ppar-α and cpt1-β (p<0.05). In addition, individual PS-MPs, TCS, and co-exposure for 7 days increased CAT and SOD activities in tadpoles. Furthermore, the highest activities of CAT and SOD were detected in TCS (1 μg·L-1)+5 μm PS (2 mg·L-1) group (p<0.05), which may result from the significantly higher expression levels of cat and sod genes (p<0.05). This study showed that the effects of the composite exposure group on the physiological levels of tadpoles were higher than those of the individual exposure group. However, the effects of different composite treatment groups on the lipid metabolism levels and antioxidant levels of tadpoles were different. These results can provide information and reference for assessing the toxic effects and ecological risks of microplastics (MPs) adsorbed lipophilic pollutants on aquatic animals.